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of 9
pro vyhledávání: '"Gregory F. Powell"'
Publikováno v:
SPIE Proceedings.
Efforts to integrate projection radiography into the digital environment have, to date, required signal degrading steps. The purpose of this study was to compare new directly acquired digital projection radiographic images to conventional film screen
Publikováno v:
SPIE Proceedings.
Progress is discussed on the improvement of a Direct RadiographyTM solid state, flat panel, digital detector designed for use in general radiographic applications. This detector, now known as DirectRayTM, operates on the principle of direct detection
Autor:
Chin-Tu Chen, Gregory F. Powell
Publikováno v:
Medical Physics. 17:1068-1068
Publikováno v:
Medical Physics. 15:581-587
An automated method for sampling lung textures in digital posterior/anterior chest images is being developed for use in computer-aided diagnosis of interstitial pulmonary diseases. In our present approach, two vertical profiles in the periphery of bo
Autor:
Ronald J. Lipinski, John E. Gronager, Michel Schwarz, Satoshi Suzuki, Kohyu Fukunishi, Alex Galperin, Yigal Ronen, Hiroyuki Tsuchiya, Yamato Asakura, Kunio Kamiya, Hideo Yusa, Masaki Takeshima, Abdul-Rahman Foad Abdul-Fattah, Waleed H. Abulfaraj, E. Teuchert, H. J. Rütten, H. Werner, Alfred L. B. Ho, Alexander Sesonske, Meyer Steinberg, James R. Powell, Hiroshi Takahashi, Hiromichi Fumoto, Erich Zimmer, Ryohei Kiyose, Erich R. Merz, Robert C. Doerner, Theodore H. Bauer, Charles L. Fink, William F. Murphy, Arthur E. Wright, André Preumont, Antonio Villalobos, A. R. Wazzan, D. Okrent, Geoffrey G. Eichholz, Barry G. Wahlig, Gregory F. Powell, T. F. Craft, Toshiaki Ohe, Akira Nakaoka, Shinji Takagi, K. L. Murty, J. R. Holland, Martin L. Grossbeck, Kenneth C. Liu, T. E. Gangwer, K. K. S. Pillay
Publikováno v:
Nuclear Technology. 58:361-367
Publikováno v:
Nuclear Technology. 58:511-520
The role of suspended particles as carriers of dissolved nuclides from high-level radioactive waste repositories has been investigated. Depending on the concentrations of suspended particles and th...
Autor:
Gregory F. Powell, Chin-Tu Chen
Publikováno v:
Medical Physics. 14:1079-1086
A method to calculate absorbed doses at depths in the walls of a static spherical bladder from a positron emitter in the bladder content has been developed. The beta ray dose component is calculated for a spherical model by employing the solutions to
Publikováno v:
Medical Imaging and Instrumentation '84.
In digital radiography the pixel size used determines the potential spatial resolution of the system. The need for spatial resolution varies depending on the subject matter imaged. In many areas, including the chest, the minimum spatial resolution re
Akademický článek
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